git grep: be careful to use mutexes only when they are initialized

diff --git a/builtin/revert.c b/builtin/revert.c
index 010508d571a5425aac2e0f5390ebac9698a5d1cb..87df70edc33fcc71177b863e6ced870330e505d0 100644 (file)
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -302,7 +302,7 @@ static void write_cherry_pick_head(struct commit *commit)
        strbuf_release(&buf);
 }
 
-static void print_advice(void)
+static void print_advice(int show_hint)
 {
        char *msg = getenv("GIT_CHERRY_PICK_HELP");
 
@@ -317,9 +317,11 @@ static void print_advice(void)
                return;
        }
 
-       advise("after resolving the conflicts, mark the corrected paths");
-       advise("with 'git add <paths>' or 'git rm <paths>'");
-       advise("and commit the result with 'git commit'");
+       if (show_hint) {
+               advise("after resolving the conflicts, mark the corrected paths");
+               advise("with 'git add <paths>' or 'git rm <paths>'");
+               advise("and commit the result with 'git commit'");
+       }
 }
 
 static void write_message(struct strbuf *msgbuf, const char *filename)
@@ -564,8 +566,6 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts)
                        strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
                        strbuf_addstr(&msgbuf, ")\n");
                }
-               if (!opts->no_commit)
-                       write_cherry_pick_head(commit);
        }
 
        if (!opts->strategy || !strcmp(opts->strategy, "recursive") || opts->action == REVERT) {
@@ -586,13 +586,22 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts)
                free_commit_list(remotes);
        }
 
+       /*
+        * If the merge was clean or if it failed due to conflict, we write
+        * CHERRY_PICK_HEAD for the subsequent invocation of commit to use.
+        * However, if the merge did not even start, then we don't want to
+        * write it at all.
+        */
+       if (opts->action == CHERRY_PICK && !opts->no_commit && (res == 0 || res == 1))
+               write_cherry_pick_head(commit);
+
        if (res) {
                error(opts->action == REVERT
                      ? _("could not revert %s... %s")
                      : _("could not apply %s... %s"),
                      find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV),
                      msg.subject);
-               print_advice();
+               print_advice(res == 1);
                rerere(opts->allow_rerere_auto);
        } else {
                if (!opts->no_commit)